Add the condition function by the primary key.

src/main/scala/model/Collaborator.scala

@@ -5,6 +5,8 @@ import scala.slick.driver.H2Driver.simple._
 object Collaborators extends Table[Collaborator]("COLLABORATOR") with BasicTemplate {
   def collaboratorName = column[String]("COLLABORATOR_NAME")
   def * = userName ~ repositoryName ~ collaboratorName <> (Collaborator, Collaborator.unapply _)
+
+  def byPrimaryKey = byRepository _
 }
 
 case class Collaborator(